www.minilabels.com they do lots of stuff -I use the iron on and have different coloured labels for each childd which makes sorting clothes easier . Takes not ime to iron in - nothing gets worn till it has a label on it - sounds ridiculous but at least they rarely lose stuffand if they do it finds its way back to us.
I started with cash for all 3 dc, went for iron on ones from the uniform shop when it came to secondary as ds1 was running short - crap! reverted to cash, tried and tested and last for years. Still got the odd one or two with my name on from the year dot.